mrzak.co / Barcelona
Mr Zak Zak
Hello — I am Zak, also known as Mr Zak. This is mrzak.co, my index on the internet: bio, writing, and the things I build.
Bio / Mr Zak
Who Zak is.
Zak — online as Mr Zak, @heyMrZak, and mrzak — is a self-taught builder and growth marketer based in Barcelona. People looking for Zak or Mr Zak land here: mrzak.co.
Zak studied IT at 42Barcelona and is working through a CS degree at University of the People. Day to day: growth marketing, Flutter, React, Firebase, and shipping useful products fast.
Legal name: Zakariae Boussaidi. Public name: Zak / Mr Zak. Currently building Gofy and Recatch. Writing on mrzak.co/blog and @heyMrZak.
- Call me
- Zak / Mr Zak
- Site
- mrzak.co
- Handle
- @heyMrZak
- Base
- Barcelona
Writing / Zak
Where Zak writes.
Long-form notes on mrzak.co. Short takes as @heyMrZak. Same Zak, different length.
- Mr Zak Blog Build logs, vibe coding, and growth notes by Zak.
- Latest post Building Gofy in public for RevenueCat Shipaton 2026.
- Vibe coding Vibe Coding for Beginners: build without breaking it every time.
- Origin story How Zak started: 14, broke, clicking ads for cents.
- X / Mr Zak Shorter thoughts, shipping updates, and public notes from Zak.
Building / Zak
What Zak builds.
Live products first. Past bets stay listed because Zak shipped them — including the ones that died.
- Gofy Hyperlocal Barcelona map for live deals, free food, and urgent offers. Built by Zak.
- Recatch Flutter and Firebase mobile memories app. Solo-founded by Mr Zak.
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Grow Genius SL Digital marketing agency Zak founded. Google and Meta Ads for B2B and B2C clients.
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DevilBuzz Viral content platform grown to 3,000+ MAU with zero ad spend.
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Jabberin Jack Halloween store that hit 1,000+ orders in one season.
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SpeakRoom Flutter language app Zak stopped pre-launch when unit economics failed.
Elsewhere / mrzak
Find Zak on the internet.
Looking for Mr Zak, Zak, or mrzak? Same person. Pick a door.